i thought silica would lead to uncontrollable algea...just a myth?
it would take an absurd number of years for the silicate to actually leech out and do any harm. i cant remember the speaker but they confirmed that it is bs about not being tank safe, apperantley it was a deal made between companys to not steal business so they put not tank safe on the bags.
i have had it in mytank for two plus years and had no problems with algae blooms or water conditions